CVE-2026-43482

System hang via preempted sched_ext exit handling

Published May 13, 2026 · Updated May 13, 2026

Affected Linux Kernel builds from 6.12 contain a sched_ext race that allows local users to hang the system through a failing BPF scheduler. scx_claim_exit() disables further error handling before its callers queue helper work, but preemption can interrupt that sequence and leave bypass teardown unqueued. The condition requires a sched_ext BPF scheduler that fails to reschedule the preempted caller; task dispatch then stops and the host wedges.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Affected Linux Kernel builds from 6.12 contain a sched_ext race that allows local users to hang the system through a failing BPF scheduler. scx_claim_exit() disables further error handling before its callers queue helper work, but preemption can interrupt that sequence and leave bypass teardown unqueued. The condition requires a sched_ext BPF scheduler that fails to reschedule the preempted caller; task dispatch then stops and the host wedges.

The record

CVE
CVE-2026-43482
Published
May 13, 2026
Updated
May 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 13, 2026CVE publishedPublication date reported by the CVE source.
  2. May 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.12
  2. Affected versionversion=f0e1a0643a59bf1f922fa209cec86a170b784f3f <41423912f7ac7494ccd6eef411227b4efce740e0
  3. Affected versionversion=f0e1a0643a59bf1f922fa209cec86a170b784f3f <5131dbec2c10961b34f844bc30b400c3fa0bcc72
  4. Affected versionversion=f0e1a0643a59bf1f922fa209cec86a170b784f3f <522acaae34aa7e05859260056b39c7c030592a0c
  5. Affected versionversion=f0e1a0643a59bf1f922fa209cec86a170b784f3f <83236b2e43dba00bee5b82eb5758816b1a674f6a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.12; version=f0e1a0643a59bf1f922fa209cec86a170b784f3f <41423912f7ac7494ccd6eef411227b4efce740e0; version=f0e1a0643a59bf1f922fa209cec86a170b784f3f <5131dbec2c10961b34f844bc30b400c3fa0bcc72; version=f0e1a0643a59bf1f922fa209cec86a170b784f3f <522acaae34aa7e05859260056b39c7c030592a0c; version=f0e1a0643a59bf1f922fa209cec86a170b784f3f <83236b2e43dba00bee5b82eb5758816b1a674f6a

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.1Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
0.0Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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